The showbiz friends were spotted partying up a storm on the sumptuous yacht, sipping cocktails and downing tequila shots as they cruised along the Mediterranean coastline. They were also seen riding jetskis and rubber rings pulled by speedboats.

The pair reportedly splashed £300,000 on hiring the super-yacht, putting a further £200,000 aside for restaurant and nightclub bills, according to the Mail.

They will then follow the fortnight with a relaxing weekend in Barbados to recuperate. Cara and Rihanna became good friends after meeting at the Victoria's Secret

show last year. Rihanna was performing at the glitzy runway presentation, while Cara took to the catwalk to model one of the brand's creations.

Typically, Rihanna and Cara are taking to Instagram to share pics of their holiday with fans.

Cara uploaded a photo of the pair on a boat, which was set to take them to the yacht. "#Montecarlo #timetosetsail," she captioned the snap.

She also posted a picture that saw her posing with Rihanna's best friend Melissa Forde.